#!/usr/bin/perl -w

use strict;
my $key = 'JUMP';

if (
  ($key eq 'ID')
    or ('TITLE')
    or ('GENE')
    or ('CYTOBAND')
    or ('LOCUSLINK')
    or ('CHROMOSOME')
    or ('SCOUNT')
) {
    print "I don't know why this is printing.\n";
}

##</code><code>##

if (grep {$key eq $_} qw(ID TITLE GENE CYTOBAND LOCUSLINK CHROMOSOME SCOUNT)) {
  print "This didn't print, did it?\n";
}

##</code><code>##

if (exists $is_valid{$key}) {
  print "Key '$key' is a valid key\n";
}